Hair iron



FIG. 1 is a top perspective view of a hair iron showing my new design;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings illustrate portions of the hair iron and form no part of the claimed design. 

The ornamental design for a hair iron, as shown and described. 